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Calculated
DRILL
Drilling/drill rig
4
GISP
4
GISP2
4
GRIP/GISP/NGRIP
4
Greenland Ice Core Projects
4
Sampling/drilling ice
4
ice/snow
AGE
3
DEPTH
3
Gas age
2
Age
1
Age model
1
Conductivity
1
Depth
1
Elzone Particle Counter
1
Grain size
1
Methane
1
Particle concentration
1
Size
1
beta
1
bottom/max
1
electrical
1
ice
1
layer counting
1
maximum/old
1
minimum/young
1
top/min
1
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